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Since the conditions for using PIO vs DMA for loading the firmware weren't totally clear, we dug deeper into the issue with Timur and ran tests to find out why things are as they are. The capabilities and constraints are as follow: - All chips supported by Nova, including Turing, can load firmware using DMA (although PIO is preferred for chips < GA102). - PIO registers are masked to the CPU from GA102 onwards. Thus PIO as a loading method is only usable on Turing and GA100. - The FWSEC firmware on Turing needs to be loaded by a bootloader with an explicit start tag. Start tags can only be explicitly mentioned when using PIO, which is thus the only method by which the bootloader can be loaded. - Any firmware loadable by DMA is also loadable by PIO. These observations orient the direction of the code in this revision. Notably, the usable loading methods of each firmware are expressed by implementing the traits `FalconDmaLoadable` and `FalconPioLoadable`. The bootloader-enabled FWSEC firmware is now a wrapper type that includes the regular, DMA-loaded FWSEC firmware (which is still loaded using DMA, only by the bootloader), and the bootloader that needs to be loaded using PIO. This new structure only implements `FalconPioLoadable`. All other firmwares implement `FalconDmaLoadable`, which provides a method to try and provide a `FalconPioLoadable` proxy. This method is fallible because some of the PIO types are smaller than the DMA ones, and such conversions must be fallible. Since this adds code that is limited to Turing and will likely never be useful for any other chip, we tried to isolate it into its own modules. This series is based on -next and should apply cleanly on `drm-rust-next` after -rc1 is tagged. A tree with all the patches is available at [1]. [1] https://github.com/Gnurou/linux/tree/b4/turing_prep Signed-off-by: Alexandre Courbot Changes in v9: - Add a few preparatory patches to simplify the actual feature patches. - Use a wrapping type for the bootloader. - Simplify the falcon loading code and move the complexity to the firmware types. - Add the generic bootloader files to `ModInfoBuilder`. - Link to v8: https://lore.kernel.org/all/20260122222848.2555890-1-ttabi@nvidia.com/ --- Alexandre Courbot (7): gpu: nova-core: falcon: rename load parameters to reflect DMA dependency gpu: nova-core: require DmaObject on FalconDmaLoadable, not FalconFirmware gpu: nova-core: falcon: remove generic argument from dma_wr gpu: nova-core: falcon: remove FalconFirmware's dependency on FalconDmaLoadable gpu: nova-core: move brom_params and boot_addr to FalconFirmware gpu: nova-core: make Chipset::arch() const gpu: nova-core: add gen_bootloader firmware to ModInfoBuilder Timur Tabi (2): gpu: nova-core: add PIO support for loading firmware images gpu: nova-core: use the Generic Bootloader to boot FWSEC on Turing drivers/gpu/nova-core/falcon.rs | 291 +++++++++++++++++++-- drivers/gpu/nova-core/falcon/hal.rs | 6 +- drivers/gpu/nova-core/firmware.rs | 51 ++-- drivers/gpu/nova-core/firmware/booter.rs | 48 ++-- drivers/gpu/nova-core/firmware/fwsec.rs | 42 +-- drivers/gpu/nova-core/firmware/fwsec/bootloader.rs | 276 +++++++++++++++++++ drivers/gpu/nova-core/gpu.rs | 9 +- drivers/gpu/nova-core/gsp/boot.rs | 15 +- drivers/gpu/nova-core/regs.rs | 30 +++ 9 files changed, 672 insertions(+), 96 deletions(-) --- base-commit: 5c009020744fe129e4728e71c44a6c7816c9105e change-id: 20260204-turing_prep-6f6f54fe1850 Best regards, -- Alexandre Courbot